CVE - CVE-2024-49854

CVE-ID
CVE-2024-49854	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: block, bfq: fix uaf for accessing waker_bfqq after splitting After commit 42c306ed7233 ("block, bfq: don't break merge chain in bfq_split_bfqq()"), if the current procress is the last holder of bfqq, the bfqq can be freed after bfq_split_bfqq(). Hence recored the bfqq and then access bfqq->waker_bfqq may trigger UAF. What's more, the waker_bfqq may in the merge chain of bfqq, hence just recored waker_bfqq is still not safe. Fix the problem by adding a helper bfq_waker_bfqq() to check if bfqq->waker_bfqq is in the merge chain, and current procress is the only holder.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7f URL:https://git.kernel.org/stable/c/0780451f03bf518bc032a7c584de8f92e2d39d7f MISC:https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583 URL:https://git.kernel.org/stable/c/0b8bda0ff17156cd3f60944527c9d8c9f99f1583 MISC:https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eaf URL:https://git.kernel.org/stable/c/1ba0403ac6447f2d63914fb760c44a3b19c44eaf MISC:https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726 URL:https://git.kernel.org/stable/c/63a07379fdb6c72450cb05294461c6016b8b7726 MISC:https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fe URL:https://git.kernel.org/stable/c/cae58d19121a70329cf971359e2518c93fec04fe MISC:https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bd URL:https://git.kernel.org/stable/c/de0456460f2abf921e356ed2bd8da87a376680bd
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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